Yeah maybe there are around the same AMOUNT of 50/50s, but outside of Flash, the strength of the 50/50s in Injustice 2 are much more toned down.
In MKX there were characters like Sub-Zero who got a 33/33/33 for huge damage of a knockdown in the corner. Or characters like Sonya, Cassie, Ermac, Reptile, Sub again, sorta Triborg, Alien, and more who had powerful standing mixes for good damage. Or characters like Kotal and Alien who could initiate a 50/50 off half screen mids, a lot of mixups built into strings like Mileena, and even teaching a throw was a 50/50.